Welcome to the community!
Was it the 75u for $45/mo promotion you got? I do see it says the deal is for 12 months.
I know sometimes Fido can only apply a promotion for 6 months at a time and then after that, they would apply the other 6 months. I'm not sure if that's the case here.
Either way, I would suggest you reach out to customer service to make sure.
You can contact customer service through any of the available methods listed here.